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Influence of Crystallization Behavior of the Metal/Glass - Ceramic Composite Coating on the High Temperature Oxidation Resistance of the Coating

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  • (1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. College of Automotive Engineering, Hunan Industrial Polytechnic, Changsha 410208, China;3. Sheqi Branch of Nanyang Municipal Ecology and Environment Bureau, Nanyang 473399, China)

Received date: 2022-05-20

  Revised date: 2022-06-29

  Accepted date: 2022-07-13

  Online published: 2023-12-25

Abstract

According to the harsh environment faced by the core thermal parts of aero - engines and the excellent high - temperature protection performance of the glass - ceramic coating, the flow - coating method was used to prepare nickel - containing B2O3 - Al2O3 - BaO - CeO2 metal/glass - ceramic composite coating (Ni/BABC) on the surface of the nickel - based alloy GH4586 for aero - engines. Differential thermal analysis (DTA), X - ray diffraction (XRD), scanning electron microscope/energy dispersive analysis (SEM/EDS), weight gain method and other test methods were used to study the effects of different nucleating agents and different heat treatment processes on the crystallization behavior of glass - ceramic with a constitution of B2O3 - Al2O3 - BaO - CeO2 and the effects of crystallization behavior on the high temperature oxidation resistance of the composite coating. Results showed that 4% (mass fraction) ZrO2 could achieve the best nucleation effect as a nucleating agent, and the precipitated crystal phase was BaAl2B2O7. The best crystallization process for the glass - ceramic was an annealing at 650 ℃ for 30 h. The longer the annealing time, the higher the crystallization rate. Additionally, after 30 h, the crystallization rate tended to be stable at about 46%. The glass - ceramic composite coating had a significant protective effect against the high - temperature oxidation of the substrate. The coating sample with a crystallization rate of 46% had the lowest oxidation weight gain rate, gaining a weight of only 1.129 0 mg/cm2 after oxidation at 900 ℃ for 30 h. Furthermore, it had the most uniform and dense structure after oxidation, its surface was smooth, and its high temperature oxidation resistance was excellent.

Cite this article

JIANG Zonghao, GU Yi, SHI Xiaozhao, YANG Xueting, WANG Zhihui, QI Jie . Influence of Crystallization Behavior of the Metal/Glass - Ceramic Composite Coating on the High Temperature Oxidation Resistance of the Coating[J]. Materials Protection, 2022 , 55(11) : 28 -36 . DOI: 10.16577/j.issn.1001-1560.2022.0304

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